Measurement of B(K -> pnn)

TL;DR

This paper reviews the experimental measurement of the rare decay B(K -> pnn), highlighting recent results from experiment E787 at BNL which measured its branching ratio and discussing future data prospects.

Contribution

It presents the first measurement of the B(K -> pnn) decay branching ratio from experiment E787 and discusses future experimental prospects.

Findings

Branching ratio measured as (1.5^{+3.4}_{-1.2}) x 10^{-10}

Results are consistent with Standard Model predictions

Future data collection plans are outlined

Abstract

The experimental measurement of positive kaons decaying to a positive pion and a neutrino, anti-neutrino pair (pnn) is reviewed. Recent results from experiment E787 at BNL are presented: with data from 1995--97 the branching ratio has been measured to be B(pnn) = (1.5^{+3.4}_{-1.2}) \times10^{-10}. The future prospects for additional data in this mode are examined.